Question

1)Первую треть пути тело двигается с постоянной скоростью 40км/ч,вторую - 60 км\ч,а третью - со скоростью 120 км\ч. Определить среднюю скорость на всем пути. 2)Минутная стрелка часов в три раза длиннее секундной.Во сколько раз быстрее движется секундная стрелка,чем минутная?

Answer 1

1)(40+60+120)/3=73 км с 2) в 3 раза из за массы

Answer 2

1) Average Speed Calculation

To calculate the average speed for the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

Let's calculate the average speed for the given scenario.

1st leg: Speed = 40 km/h 2nd leg: Speed = 60 km/h 3rd leg: Speed = 120 km/h

We need to find the total distance and the total time taken for the entire journey.

The total distance is not provided, so we'll assume a distance of 120 km for each leg for simplicity.

Total distance = 120 km + 120 km + 120 km = 360 km

Now, let's calculate the total time taken for the entire journey.

Time taken for 1st leg = Distance / Speed = 120 km / 40 km/h = 3 hours Time taken for 2nd leg = Distance / Speed = 120 km / 60 km/h = 2 hours Time taken for 3rd leg = Distance / Speed = 120 km / 120 km/h = 1 hour

Total time taken = 3 hours + 2 hours + 1 hour = 6 hours

Now, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Average Speed = 360 km / 6 hours = 60 km/h

So, the average speed for the entire journey is 60 km/h.

2) Clock Hand Speed Comparison

Given that the minute hand is three times longer than the second hand, we can use the ratio of the lengths of the clock hands to determine the ratio of their speeds.

Let's denote: - Length of the second hand as 's' - Length of the minute hand as '3s' (since it's three times longer)

The speed of the tip of a clock hand is inversely proportional to its length. Therefore, the ratio of the speeds of the second hand to the minute hand is the inverse of the ratio of their lengths.

So, the ratio of their speeds is: Speed of second hand : Speed of minute hand = 3 : 1

This means the second hand moves three times faster than the minute hand.

If you have any further questions or need additional assistance, feel free to ask!